本文介绍了一种新的制备MgB2膜的方法——溶胶凝胶法.以Mg(BH4)2的乙醚溶液(Mg(BH4)2·Et2O)作为前驱体,将其覆涂于Al2O3(001)衬底上,并在Mg气氛保护下高温退火,得到了MgB2的多晶膜.与其它制备MgB2膜的方法相比,这种方法制备的膜具有较高品质,超导转变温度达到37K,临界电流密度Jc(5K,0T)～5×106A/cm2,上临界场Hc2(0)～19T.对于MgB2厚膜及线带材的制备,溶胶凝胶法被证明是一种极具潜力的方法. In this paper, a new method of preparing MgB2 film, sol-gel method, is introduced by using Mg (BH4) 2 ether solution (Mg (BH4) 2 · Et2O) Substrate and annealed at high temperature under the protection of Mg atmosphere to obtain a polycrystalline film of MgB2. Compared with other methods for preparing MgB2 films, the film prepared by the method has high quality, the superconducting transition temperature reaches 37K, and the critical Current density Jc (5K, 0T) ~5 × 106A / cm2, upper critical field Hc2 (0) ~ 19T. For the preparation of MgB2 thick films and ribbons, the sol-gel method proved to be a promising method .